205832981 has 4 divisors (see below), whose sum is σ = 212930700. Its totient is φ = 198735264.

The previous prime is 205832969. The next prime is 205832989. The reversal of 205832981 is 189238502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147233956 + 58599025 = 12134^2 + 7655^2 .

It is a cyclic number.

It is not a de Polignac number, because 205832981 - 2¹⁰ = 205831957 is a prime.

It is a super-2 number, since 2×205832981² = 84734432134692722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205832989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3548816 + ... + 3548873.

It is an arithmetic number, because the mean of its divisors is an integer number (53232675).

Almost surely, 2^205832981 is an apocalyptic number.

It is an amenable number.

205832981 is a deficient number, since it is larger than the sum of its proper divisors (7097719).

205832981 is an equidigital number, since it uses as much as digits as its factorization.

205832981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7097718.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 205832981 is about 14346.8805320181. The cubic root of 205832981 is about 590.4344028619.

The spelling of 205832981 in words is "two hundred five million, eight hundred thirty-two thousand, nine hundred eighty-one".